Double-pendulum scale



Ap g, T1925.

vDOUBLE PENDULUM S CALE Filed Dec, 26, 1.919

5 Sheets-Smet 1 April 14, 1925.

H. o; HEM

DOUBLE PENDULUM SCALE .Filed Dec. 26. 1919 3 Sheets-Sheet 2 H. O. HEM

DOUBLE PENDULUM SCALE April 14, 1925. Y l 1,533,113

Filed Danze, 1919 s sheets-sheet s a l JZ Vl?:untreated Apr. v14:, 1925.,

. UNITED STATE-:s

insane PATENT ePrice,

HALVOR O. HEM, OF TOLEDO, OHIO, ASSIGNORO'TO'LEDOSCALE COMPANY, OF TOLEDO, OHIO, A CORPORATION 2OF NEVI JERSEY.

DOUBL'E-PENDULUM SCALE.

`Application led December 26, 1919. lSerial No. 347,430.

fo all fw 7mm t .may .concern Be .it known .that I, HAnvon O. HEM, a citizen 4of 4the United States, residing 4at Toledo., in .the county .of Lucasand State of Ohio, have `invented certain new and useful Improvements in Double-Pendulum `Scales, of which the following .is `a.specification.

This invention relates `to weighing scales in which the load on the platform is .offset .by swinging counterpoises or .pendu-lunas., and has for its principal object the 4provision of a compact scale of this type in which the counterbalancing mechanism is not deranged when the .scale is thro-wn out of level.

Another .object is 'the provision of a pendulum scale having .a rfan-shaped chart and compensating vpendu-lume, one of which is directly connected .to the indicator moving over the chart. y

Another object .is to so connect the dash :pot plunger vto the weighing :mechanism that itniay move substantially rectilinear-'ly and without .tendency to bind.

Still another object is to connect the dash pot plunger to 4the scalelever through the knife edge pivots employedA in connectingl `the lever to the counterbalancing mechanism.

Other objects and yac'lvantages will be apparent from the following description, in which reference is had to the accompanying drawings illustrating a preferred embodiment of my vinvention and in which similar reference numerals designate similar parts throughout the several views.

In the drawings z- Figuro `1 Ais a front elevation. of a scale elnlmdying my invention, part of the housing being broken away to .sl-low lthe loadotlisetting mechanism Figure 2 is an enlarged elevation of the 'load-offsetting mechanism shown in Figure 1;

Figure 3 is a horizontal section takensubn stantially on the line of Figure 2.;

Figure 4 is an elevation showing a portion of the connection between the platform lever mechanism and the load-osetting mechanism.; and

Figure 5 .is a lhorizontal sectional View taken'substantially on the line 5-5 of `Figon knife-edge l'pivo'ts -5 and 6 which are supported 'in bea-rings 7 and 8. The bearings 8 which support the lower pendulum 4 are Amounted `in brackets extending `ulmfard-ly .into the watch-casing portion -of the housing 1, and the bearings 7 supportingthe upper pendulum V3 yare :mounted in brackets (not shown) which extend downwardly into the casing, Rigid with the .upper pendulum 3 is .an eccentric power sector 9 to which is secured ythe .upper end of the flexible steel band vor 'ribbon 10. The ribbon 10 passes over the curved face of the sector 9 and extends downwardly, .its lower end being connected to the crossbar 11 which is secured to upright vmembers 12 of a suspended frame, the said `frame serving to connect the platform lever .mechanism of the scale to the pendulum inechanisn'i and to a dash pot shockahsorbing device. The uprights .12 are sub` sta ntially parallel tlu'ou ghon t the ni aj or po rtions of tl'lei-r lengths, Vand are provided at their lower ends with `lateral extensions or feet 13. From vthe lower edges of the feet '13 horizontal bars 14 extend toward each other, the adjacent ends of the bars 14 'being turned downwardly, as at 15, and secured .respectively to opposite sides of abracket 1G. At each end of the bracket member 16 is carried a bearing niember 17` thebearing C members, being secured to the bracket by means of ,pins so that they are free to swing laterally to a limited extent. The

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rear end of the main platform lever 18 is bifurcated, as at 19, so that the nose 2O of the lever is in eilect broadened, while its weight is not appreeiably increased. Knifeedge pivots 2l project from the nose 2O and are rockably carried in the bearings i7.

Rigid with the lo-wer pendulum 3 is an eccentric power sector 28 to which is secured the upper end of a flexible steel band or ribbon 2i. The ribbon 24textends downwardly over the curved face oi the power sector 23 and is secured at its lower end to the bracket 1G.

An index 25 is rigidly connected to the upper pendulum 3 and extends upwardly into the tan-shaped portion of the housing l, in which is displayed a chart 2G over which the index 25 is adapted to swing when the pendulum load-offsetting mechanism is displaced by a load on the scale platform. Since the rear end of the platform lever is suspended by both the ribbons 10 and 2li and since the pendulums swing oppositely` tilting the scale in either direction will have an opposite eliect on cach ol the pendulums. Assuming that the pendulums are in weighing position (shown in dotted lines in Figure 2), it the scale be tilted to the right, the pull of the pendulum t upon the platform lever will decrease and the pull ot' the pendulum 3 will increase in the same degree so that the position of the indicator hand will remain unchanged. lVhen the pendulum mechanism is in the position shown in full lines in Figure 2, there is suliicient initial pull upon the ribbons 10 and 24 so that the scale may be tilted slightly without causing any change in the relative position of the pendulums. It the scale be tilted, for example, to the right, the tension of the ribbon 24k will be slightly decreased, while the tension of the ribbon 10 will be increased to the same extent, the resultant pull upon the nose oit the platform lever remaining constant.

Secured between the upper ends ot the uprights 12 is a block, 'from one side ot which projects an elbow member 2S and pivoted to the depending end of the member 2S is the upper end el the dash pot plunger rod 2t), the lower end oit which is secured to a plunger mounted to reciprocate in the dash pot 530. The connection between the dash pot. plunger and the main lever oi the scale is therefore through the knife-edge pivots 2l., and owing to the comparatively great length oi the uprights l2 the plunger may reciprocate substantially vertically, thus obviating any tendency of the plunger or plunger rod to bind against any portion of the dash pot.

lVhile it will be apparent that the illustrated embodiment of my invention herein disclosed is well calculated to adequately fultill the objects primarily stated, it is to be understood that the invention is susceptible to variation, modification and change within the spirit and scope ot the subjoined claims.

Having described my invention, I claim:

l. In a weighing scale, in combination, a lever, a pair of oppositely-swinging pendulums arranged one over the other, and operative connections `trom said lever to said pendulums.

2. In a weighing scale, in combination, a lever, a pair of oppositely-swinging pendulums mounted on knife-edge pivots, the corresponding pivots being in the same vertical plane, and connections from said lever to said pivots.

3. In a weighing scale, in combination, a. pair ot oppositely-swinging pendulums, an upright frame, a connection from said iraine to one of said pendulums, a lateral extension on said frame, a connect-ion from said lateral. extension to the other of said pendulums, and a lever connected to said iframe.

4t. In a weighing scale, in con'ibination, a lever having a biiurcated end, aligned pivots on the bit'urcations oi said lever, and oppositely-swinging pendulums connected to said pivots.

5. In a weighing scale, in combination, a lever, spaced aligned pivots on said lever, a iframe, spaced aligned bearings on said frame receiving said pivots, and a pair ot pendulums connected respectively to opposite sides of said frame.

6. In a weighing scale, in combination, a lever, spaced aligned pivots on said lever, a trame, spaced aligned bearings on said i'rame receiving said pivots, and a pair ot pendulums connected respectively to opposite sides of said frame, said pendulums being mounted one above the other.

7. In a weighing scale, in combination, a lever, load-otisetting mechanism, a shockabsorbing device, and a floating iramc coniiccting said lever, load-oil'setting mechanism and shock-absorbing device.

8. In a weighing scale, in combination, a, lever, a pair oil oppositidy-swinging pendulums, a shock-absorbing device, a iloatiing liranie said iframe comprising an upright portion connected to said dash pot and one ot said penduluu'is, and a latorally-extendVv ing toot; connected to saidy lever and the other ol said pendulums.

t). In a weighing scale, in combination. a pair ot pendulums arranged one above the other, oppositely-cxtending power sectors on said pendulums, ribbons secured to and overlying said power sectors, and a lever connected to said ribbons.

l0. In a weighing scale, in combination, a pair of pendulums arranged one above the other, oppositely-extending power sectors on said pendulums, ribbons secured to and overlying said power sectors, an upright frame suspended by said ribbons,` and a lever connected through knife-edge pivots lever Connected to said frame. to said frame, and a dash pot shook absorber 10 11. In a Weighing scale, in combination, connected to said frame.

a pair of penduhuns arranged one above 5 the other, oppostely-extendng power see- HALVOR O' HEM' tors on said pendnlums, ribbons secured to Witnesses: and overlying said power sectors, an up- C. 0. MARSHALL,

right, frame suspended by said ribbons, a FRANCES DOYLE. 

